We have developed and deployed a Web-based wireless classroom interaction system in a large-enrollment introductory physics lecture class that uses HP handheld computers (PDAs) to facilitate real-time two-way student interaction with the instructor. Our system is ahead of other "clicker" based systems that are primarily limited to multiple-choice responses. Our system allows for a variety of questions including short answer questions. It also allows for adaptive questioning and two-way

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... tion that provides real-time feedback to the instructor. We have demonstrated learning gains in our courses through use of this technology compared to earlier technology (PRS) used in the same class. We have also shown that students who use PDAs more often in class are more likely to perform better in the course.